Beam forming network for multibeam array antenna

Details Beam forming network for multibeam array antenna Beam forming network for multibeam array antenna

1982-04-05

1986-04-22

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

307513, H01Q 340

Patent

active

045845816

ABSTRACT:
A resistive-coupling type beam forming network for a multibeam array antenna involving symmetry in the arrangement of antenna elements and/or the arrangement of beams. In the network, a matrix is formed of distribution lines from four-phase splitters each receiving two input signals in the relationship of mutual complex conjugates and outputting four-phase signals, output summing lines and coupling resistors for coupling specific distribution lines with output summing lines. Owing to the fact that each four-phase splitter and each set of four distribution lines per splitter can be shared for two input signals of complex conjugates, and where the arrangement of beams or antenna elements on the output side has symmetry, each coupling resistor can be shared for two output signals of complex conjugates, the number of coupling points of the matrix is notably decreased, beam forming characteristics are improved and the size and weight of the whole network are reduced accordingly.

REFERENCES:
patent: 3176297 (1965-03-01), Forsberg
patent: 3255450 (1966-06-01), Butler
patent: 3345585 (1967-10-01), Hildebrand
patent: 3422438 (1969-01-01), Marston
patent: 3621406 (1971-11-01), Johns
patent: 4041501 (1977-08-01), Frazita et al.
patent: 4223283 (1980-10-01), Chan
patent: 4231040 (1980-10-01), Walker

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